scholarly journals A 110 Year Sediment Record of Polycyclic Aromatic Hydrocarbons Related to Economic Development and Energy Consumption in Dongping Lake, North China

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6828
Author(s):  
Wei Guo ◽  
Junhui Yue ◽  
Qian Zhao ◽  
Jun Li ◽  
Xiangyi Yu ◽  
...  
Keyword(s):  
North China ◽  
Energy Structure ◽  
Coal Consumption ◽  
Regional Energy ◽  
Open Policy ◽  
Structure Changes ◽  
Factorization Model ◽  
Polycyclic Aromatic ◽  
Dongping Lake ◽  
The Impact

A sedimentary record of the 16 polycyclic aromatic hydrocarbon (PAH) pollutants from Dongping Lake, north China, is presented in this study. The influence of regional energy structure changes for 2–6-ring PAHs was investigated, in order to assess their sources and the impact of socioeconomic developments on the observed changes in concentration over time. The concentration of the ΣPAH16 ranged from 77.6 to 628.0 ng/g. Prior to the 1970s, the relatively low concentration of ΣPAH16 and the average presence of 44.4% 2,3-ring PAHs indicated that pyrogenic combustion from grass, wood, and coal was the main source of PAHs. The rapid increase in the concentration of 2,3-ring PAHs between the 1970s and 2006 was attributed to the growth of the urban population and the coal consumption, following the implementation of the Reform and Open Policy in 1978. The source apportionment, which was assessed using a positive matrix factorization model, revealed that coal combustion was the most important regional source of PAHs pollution (>51.0%). The PAHs were mainly transported to the site from the surrounding regions by atmospheric deposition rather than direct discharge.

scholarly journals Subsidies, Clean Heating Choices, and Policy Costs: Evidence from Rural Households in Northern China

2020 ◽  
Vol 13 (1) ◽  
pp. 169
Author(s):  
Jing Li ◽  
Lingling Song ◽  
Yanchun Zhu
Keyword(s):  
Low Income ◽  
Rural Households ◽  
Northern China ◽  
Atmospheric Environment ◽  
Energy Structure ◽  
Regional Energy ◽  
Gas Heating ◽  
Gas Consumption ◽  
Gas Price ◽  
The Impact

Clean heating renovation is important for optimizing the regional energy structure and improving the quality of the atmospheric environment in Northern China. According to survey data of 1298 rural households in the “coal-to-gas” reform in Hengshui of Hebei Province, in this paper, we construct a clean heating subsidy model which focuses on clean heating choices, the reburning rate, and the subsidy cost. The key parameters affecting farmers’ choice of clean heating, including the lifeline, classification of rural households, and gas price elasticity, are estimated. Furthermore, we simulate changes between the existing and new subsidy policies, including the impact on the welfare of rural residents. We present the following findings: (1) under the current subsidy standard, the level of gas heating lifeline in Hengshui is 700 m3, the proportion of low-gas-consumption households is approximately 47.38%, and the reburning rate ranges from 47.38% to 63.80%; (2) under a new subsidy standard which we designed to ensure that households will not reburn the coal, the optimal subsidy value is 1.23 CNY/m3, the optimal subsidy volume is 970 m3, and the total subsidy demonstrates an increase of 46.21%; and (3) the government’s subsidy standards should focus on low-income households.

Assessing the Impacts of Inter-Regional Power Transmissions on Energy Structure in China’s Power Sector

2014 ◽  
Vol 962-965 ◽  
pp. 1757-1761
Author(s):  
Jie Zhao ◽  
Can Wang ◽  
Min Hua Ye
Keyword(s):  
Renewable Energy ◽  
Energy Use ◽  
Optimal Allocation ◽  
Power Transmission ◽  
Thermal Power ◽  
Energy Structure ◽  
Regional Power ◽  
Power Sector ◽  
Regional Energy ◽  
The Impact

Ultra-high voltage (UHV) inter-regional power transmissions not only can upgrade the optimal allocation ability of electricity energy in a wider range, but also can link the renewable energy power plant center and electricity load center. We use a bottom-up optimization model based on six regional power grids to simulate the impact of inter-regional transmission on energy structure in china’s power sector. The result shows that it maybe not has the positive effect as we had expected, the main consequence of the inter-regional power transmission is the thermal power generation migration among different regions, which has no significant effect on promoting renewable energy in the absence of other incentive policies. As a new form of inter-regional energy deployment, UHV inter-regional power transmission will change our future regional energy use, as well as air emissions, greenhouse gas emissions and other development path, so we also put SO2, NOx and CO2 emission control into consideration.

scholarly journals Primary Energy Consumption Structure and The Influencing Factors In China: An Income Decomposition and Post-Economic Crisis Era Perspective

2021 ◽  
Author(s):  
Ting Wang ◽  
Jianghua Liu ◽  
Yongqiang Xu
Keyword(s):  
Energy Consumption ◽  
Influencing Factors ◽  
Fossil Fuels ◽  
Primary Energy ◽  
Energy Structure ◽  
Energy Prices ◽  
Structure Changes ◽  
Resources Distribution ◽  
Impact Of Urbanization ◽  
The Impact

Abstract China’s coal-based energy structure makes its carbon peak and neutrality goals very challenging. Therefore, the optimization of the energy structure has become an important means, and exploring its influencing factors and trends has become the basis and prerequisite for the formulation of policies related to the optimization of the energy structure. This study adopts regression methods considering heteroskedasticity and cross-section correlation to study the panel data of 30 provinces in China, and obtains the changes of relationship between the fossil and non-fossil fuels consumption of different regions and their influencing factors after two global financial crises. Research results show that, China's energy consumption tends to decouple from GDP. Income structure changes especially trade changes are important factors in influencing energy consumption and energy structure. The deviation of energy resources distribution and consumption distribution tends to strengthen. The impact of urbanization development models, energy prices and efficiency shows regional heteroskedasticity.

scholarly journals Review on Sublethal Effects of Environmental Contaminants in Honey Bees (Apis mellifera), Knowledge Gaps and Future Perspectives

2021 ◽  
Vol 18 (4) ◽  
pp. 1863 ◽  
Author(s):  
Agata Di Noi ◽  
Silvia Casini ◽  
Tommaso Campani ◽  
Giampiero Cai ◽  
Ilaria Caliani
Keyword(s):  
Apis Mellifera ◽  
Honey Bees ◽  
Sublethal Effects ◽  
Integrated Approach ◽  
Anthropogenic Contamination ◽  
Knowledge Gaps ◽  
Pollination Services ◽  
General Decline ◽  
Polycyclic Aromatic ◽  
The Impact

Honey bees and the pollination services they provide are fundamental for agriculture and biodiversity. Agrochemical products and other classes of contaminants, such as trace elements and polycyclic aromatic hydrocarbons, contribute to the general decline of bees’ populations. For this reason, effects, and particularly sublethal effects of contaminants need to be investigated. We conducted a review of the existing literature regarding the type of effects evaluated in Apis mellifera, collecting information about regions, methodological approaches, the type of contaminants, and honey bees’ life stages. Europe and North America are the regions in which A. mellifera biological responses were mostly studied and the most investigated compounds are insecticides. A. mellifera was studied more in the laboratory than in field conditions. Through the observation of the different responses examined, we found that there were several knowledge gaps that should be addressed, particularly within enzymatic and molecular responses, such as those regarding the immune system and genotoxicity. The importance of developing an integrated approach that combines responses at different levels, from molecular to organism and population, needs to be highlighted in order to evaluate the impact of anthropogenic contamination on this pollinator species.

scholarly journals Experimental and Numerical Study of Fracture Behavior of Rock-Like Material Specimens with Single Pre-Set Joint under Dynamic Loading

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2690
Author(s):  
Bo Pan ◽  
Xuguang Wang ◽  
Zhenyang Xu ◽  
Lianjun Guo ◽  
Xuesong Wang
Keyword(s):  
Crack Initiation ◽  
Crack Propagation ◽  
Joint Angle ◽  
Simulation Software ◽  
Dissipated Energy ◽  
Energy Structure ◽  
Joint Angles ◽  
Crack Penetration ◽  
Before And After ◽  
The Impact

The Split Hopkinson Pressure Bar (SHPB) is an apparatus for testing the dynamic stress-strain response of the cement mortar specimen with pre-set joints at different angles to explore the influence of joint attitudes of underground rock engineering on the failure characteristics of rock mass structure. The nuclear magnetic resonance (NMR) has also been used to measure the pore distribution and internal cracks of the specimen before and after the testing. In combination with numerical analysis, the paper systematically discusses the influence of joint angles on the failure mode of rock-like materials from three aspects of energy dissipation, microscopic damage, and stress field characteristics. The result indicates that the impact energy structure of the SHPB is greatly affected by the pre-set joint angle of the specimen. With the joint angle increasing, the proportion of reflected energy moves in fluctuation, while the ratio of transmitted energy to dissipated energy varies from one to the other. NMR analysis reveals the structural variation of the pores in those cement specimens before and after the impact. Crack propagation direction is correlated with pre-set joint angles of the specimens. With the increase of the pre-set joint angles, the crack initiation angle decreases gradually. When the joint angles are around 30°–75°, the specimens develop obvious cracks. The crushing process of the specimens is simulated by LS-DYNA software. It is concluded that the stresses at the crack initiation time are concentrated between 20 and 40 MPa. The instantaneous stress curve first increases and then decreases with crack propagation, peaking at different times under various joint angles; but most of them occur when the crack penetration ratio reaches 80–90%. With the increment of joint angles in specimens through the simulation software, the changing trend of peak stress is consistent with the test results.

scholarly journals Size-resolved characterization of organic aerosol in the North China Plain: new insights from high resolution spectral analysis

2021 ◽  
Author(s):  
Weiqi Xu ◽  
Chun Chen ◽  
Yanmei Qiu ◽  
Conghui Xie ◽  
Yunle Chen ◽  
...  
Keyword(s):  
Radiative Forcing ◽  
North China Plain ◽  
North China ◽  
Fine Particles ◽  
Large Fraction ◽  
Organic Aerosol ◽  
Size Distributions ◽  
The North ◽  
The Impact

Organic aerosol (OA), a large fraction of fine particles, has a large impact on climate radiative forcing and human health, and the impact depends strongly on size distributions. Here we...

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